“One Captain” turns on French General Philippe Leclerc’s attack in 1940, using just one artillery battery, on elite Italian forces holed up in a fort in Chad, when the war against Nazi Germany seemed all but lost. He won.

Leclerc is also known for liberating Paris in 1944 with his 2nd Armored Division.

“Captain” “is a story about courage, what defines it, set against a background of bravery and also cowardice,” Heumann told Variety.

In 1940, “Very few people decided to continue battling against Hitler. I want to understand why, what were their characters, their psychology. That’s the modernity of the subject,” Heumann explained.